Drill puller



| sovlNcz DRILL FULLER Filed July 2, 1957 Julylg, 193s.

Patented July 19, 1938 UNITED STATES PATENT OFFICE DRILL PULLER 4Claims.

This invention relates to improvements in drill pullers and moreparticularly a device to be used for removing drills from rock and earthwhich have become frozen against dislodgment.

The primary object of this invention is to provide a drill puller of theabove mentioned character including an upright post to which is pivoteda fulcrum, bar carrying a pair of drill gripping dogs capable ofeffecting a vertical straight line pull on the drill.

A further object of this invention is to provide a drill puller of theabove mentioned character having means for exerting force in an upwarddirection to the fulcrum bar whereby said means may exert more powerthereto due to the fact that it is supported on the ground or earth fromwhence the drill is being removed.

A still further object of this invention is to provide a handle to beused in conjunction with the above mentioned means in order that thefulcrum bar may be oscillated after the drill has been loosened from itsfrozen position.

Other objects and advantages of the invention will become apparentduring the course of the following description taken with the drawing,wherein Figure 1 is a side elevational View of the device embodying thisinvention, showing a portion broken away to illustrate the location ofthe drill gripping dogs;

Figure 2 is a plan view of the same and shows the manner in which thedrill gripping dogs are carried by a pivotal plate carried by thefulcrurn bar, and

on lines 3-3 of Figure 1 looking in the direction of the arrows andillustrating the manner in which the fulcrum bar is pivotally connectedto the upper forked end of the supporting post.

In the drawing, wherein for the purpose of illustrating the inventionand wherein like reference characters will be employed to designate likeparts throughout the same, the reference character 5 will generally beemployed to designate a fulcrum bar supporting post having the lower endflared outwardly as at 6 and terminating in a flanged portion 1 capableof resting on the plank 8 supported on the ground or earth 9 inproximity to a drill D, the removal of which is desired.

The upper end of the supporting post 5 is forked as at I0 for receivinga fulcrurn bar II held in place b-y a fulcrum pin I2. One end of thefulcrum pin I2 is threaded for receiving a nut I3 and a lock washer I4is interposed between the Figure 3 is a vertical cross-sectional viewtaken I nut I3 and forked member IU. A boss I5 is formed on the fulcrumlever I I to properly space the same between the forked end I0 of thesupporting post 5 and the boss is arranged in such a manner as to allowthe pivot pin I2 to extend 5- through the central opening I5 formedtherein.

Journaled on the fulcrum lever II is a dog- `carrying plate I1 havingAan opening I8 formed intermediate its ends for receiving a pivot pin I9extending through a central opening 28 formed in a boss 2l on thefulcrum lever II. Bracing ribs 22 are disposed on the fulcrum lever IIand extend longitudinally thereof on opposite sides of the boss 2l) sothat their inner ends terminate in the boss. One end of the pivot pin I9is provided with a head 23 which is received in a recess 24communicating with the opening I8. The opiposite end of the pin I9 isthreaded as at 25 for receiving a locking nut 26.

Secured to the ends of the dog-carrying plate I1 are pins 21 and 28adapted to carry a pair of dogs 29 having drill engaging teeth 30presented to the drill D at an angle to cause the drill to be locked inplace and the teeth grip of the drill to prevent slippage. Thedog-carrying pins 21 and 28 are provided with bosses 3| to preventdisplacement of the dogs 29 against lateral movement.

It willbe noted that the pin 28 is extended a short distance forreceiving a strain plate 32 having an opening 33 at one end and anopening 34 at the opposite end. The pin 28 is received in the opening 33While the opposite end of the plate has its opening 34 passed over thescrewthreaded portion 35 forming an extension of the pin 21. A nut 36may be threaded on the screw-threaded extension 35 to allow removal ofthe strain plate 32 when the device is being positioned for operationupon a frozen drill D.

The `free end of the fulcrum lever I I is provided with an oli-setportion 31 having an extension 38 for accommodating means for exertingan upward force such as a screw jack or the like. The extension 38 iscentrally drilled as at 39 for receiving a handle 4D whereby a series ofvertical movements may be accomplished after the frozen drill D has beenloosened.

In the present instance a screw jack 4I is employed for -exerting aforce in the direction of the arrows upon the free end of the fulcrumlever and said screw jack comprises a base 42 fastened or otherwisesecured to an elongated plate 43. In order to prevent the elongatedplate 43 from being pressed into the ground when the device is inoperation, a plank or board 44 having a large surface area is mountedbeneath the elongated plate 43. A rotary screw-threaded bar 45 isrotatably mounted in the screw jack 4i and is adapted to be rotated bymeans of bevel gears 46 manually operable by means of a crank 41. Formedon the upper end of the screw-threaded bar 45 is a swivel couplingcomprising parts 4S and 49 between which is mounted ball bearings 50 toallow free rotation of the screw-threaded bar 45 relative to the part48. A lug 5| is formed on the section 48 of the swivel connection andextends between a pair of depending lugs 52 formed on the extension 38.A pin 53 or other fastening means may be provided for coupling the lug5l to the depending lugs 52.

The jack structure is normally separate from the extension 38 of thefulcrum bar H, but is readily attached thereto by means of the pin 53inserted in the lugs 5I and 52. When the jack is separated from thefulcrum bar, the extension end 38 moves downwardly, the fulcrum barbeing prevented from complete collapse by reception in the notch Illa inone side of the fork I for support in an inclined position as will beevident from an inspection of Figure 1. The fulcrum bar is thenprevented from moving laterally with respect to the post so that injuryto the bearing boss l5 will be eliminated.

It will be understood that the drill rod D will not be bent or twistedduring its removal from the bore hole in view of the fact that the dogs29 will maintain a parallel relationship irrespective of the movement ofthe fulcrum lever I'l and that the strain plate 32 will prevent unduestresses upon the dog-carrying pins 21 and 28.

It will also be understood that the device shown in the drawing is to betaken as the preferred embodiment of the invention but obviously changesin the shape, Size and arrangement of parts may be resorted to withoutdeparting from the spirit of the invention or the scope of thesub-joined claims.

I claim:

1. A drill puller of the character described, comprising a support, alever having one end fulcrumed to the upper end of the support, meanscarried by the free end of the lever for exerting a vertical forcethereto, a dog-carrying plate pivoted intermediate the ends of thelever, and a pair of dogs pivotally attached to the ends of thedog-carrying plate for engaging a drill.

2. A drill puller of the character described, comprising a verticalsupport, a fulcrum lever having one end pivotally attached to thevertical support, means for exerting a vertical force to the free end ofthe fulcrum lever, a dog-carrying plate pivotally attached intermediatethe end of the fulcrum lever, a pair of drill-gripping dogs pivotallymounted on the dog-carrying plate and means for preventing displacementof the dogs away from the drill.

3. A drill puller of the character described, comprising a verticalsupporting post, a fulcrum lever, having one end pivotally attached tothe vertical supporting post, an olset por tion formed adjacent the freeend of the fulcrum lever, an extension in direct alinement with thevertical supporting post formed on the oiset portion, a pivoteddog-carrying plate mounted intermediate the ends of the fulcrum lever, apair of work gripping dogs pivotally attached to the dogcarrying plateand means for exerting a vertical force to the fulcrum lever extension.

4. A drill puller of the character described, comprising a verticalsupporting post having a `forked upper end, a fulcrum lever pivotallysecured between the fork, an offset portion formed on the opposite endof the fulcrum lever, an extension in direct alinement with the forkedend of the vertical supporting post formed on the opposite portion, anelongated plate pivoted to the fulcrum lever intermediate its ends, apin carried by each end of the elongated plate, a dog mounted on each ofthe pins having gripping teeth for engaging the work, a plate connectingthe free ends of the pins to prevent opposed stresses applied to thepins and means carried by the extension for exerting a vertical force tothe extension of the fulcrum lever.

LOUIS SOVINCZ.

